Fifth wheel king pin lock



FIG. 1 is a perspective view of a fifth wheel king pin lock showing my new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a side elevational view thereof; and,

FIG. 4 is a rear elevational view thereof.

The bottom is not shown and disclaimed. 

The ornamental design for a fifth wheel king pin lock, as shown. 